/Engine/Source/Runtime/InputCore/Classes/InputCoreTypes.h
enum EKeyFlags { GamepadKey = 1 << 0, Touch = 1 << 1, MouseButton = 1 << 2, ModifierKey = 1 << 3, NotBlueprintBindableKey = 1 << 4, Axis1D = 1 << 5, Axis3D = 1 << 6, UpdateAxisWithoutSamples = 1 << 7, NotActionBindableKey = 1 << 8, Deprecated = 1 << 9, ButtonAxis = 1 << 10, Axis2D = 1 << 11, Gesture = 1 << 12, NoFlags = 0, }